Sight for fire-arms



(No Model.)

F. DE LORME.

SIGHT FOR FIRE ARMS.

Patented Dec. 12, 1882.

\ \-/\TNE55E5- Q.) -"Lii i l PATENT FFICEO FRANK DE LORME, OF CENTRALSQUARE, NEW YORK.

SIGHT-FOR FIRE-ARMS.

SPECIFICATION forming part of Letters Patent No. 269,023, dated December12, 1882. Application filed September 19, 1882. (No model.)

.7" 0 all whom it may concern Be it known that I, FRANK DE LORME, ofCentral Square, in the county of Oswego,in the State ofNew York, haveinvented new and useful Improvements in Adjustable Gun-Sights, of whichthe following, taken in connection with the accompanying drawings, is afull, clear, and'exact description.

This invention relates to improved means for adjustingthe sight onthebarrel of a gun; and it consistsin the combination and arrangement ofparts hereinafter lully explained, and specifically set forth in theclaim.

Referring to the annexed drawings, Figures 1 and 2 are transversesections, taken respectively in front of and centrally through thesight; and 1 ig.3isal0ngitudinal section taken in the center of thebarrel of the gun.

Similar letters of reference indicate corresponding parts.

B represents a rifle-barrel, and S the sight, which may be of anydesired style or shape, fixed to a base, A, which is fitted to slidein atransverse dovetail groove or way, a, in the top of the barrel. Thisgroove has a semi-cylindrical recess, 1', extending from the center inopposite direction part way the length of the groove. On one end of theaforesaid groove another similar but short semi-cylindrical recess formsa shoulder, b, for the purpose hereinafter explained. The sight-base Ais provided on its under side with a screwthreaded channel, 0, extendingnearly the length thereof, that end of the channel 0 which is over theshoulder 11 in the way abeing smooth.

dis the adjusting-screw, having its threaded portion or screw proper, 6,larger in diameter than its manipulating stem orend portion, and fittedinto the recess 1* of the way a. The threads of said screw correspondwith those of the channel 0 of the sight-base. From the end of the screw0 projects a circumferentiallyreduced extension, which has a blank neck,12,

adjacent to the screw e, and is screw-threaded from a point over theshoulder 12 to its extremity, as shown atf, and on this screwthreadedportion is fitted a jamnut, h, which, by its abutting against theshoulder 12, serves to bind the adjusting-screw so as to prevent it fromturning.

The described devices areapplied to the barrel of the gun and operatedinthe following manner: The adjusting-screw being placed in the recess 0',the base A of the sight is entered into the groove a and pushed up tothe screw e,-and is then drawn farther into the groove by turning theadjusting-screw. The jam-nut h is then applied to the extension fof theadjusting-screw. To adjust the sight in its required position, theadjusting-screw is turned to move the sight into said position, andthen, while holding the adjusting-screw with one hand,the clamping-nuthis turned with other hand until it becomes firmly set against theshoulder b.

Havingdesciibed my invention, \vhat Iclaim as new, and desire to secureby Letters Patent,

ise The combination of the barrel having the groove or way (1., providedwith the recess 1* and shoulder b, the sight-base A, fitted to slide inthe way a, and provided with the screwthreaded channel 0, theadjusting-screw (1, having its threaded portion 0 fitted in the recessr, and provided with the threaded extension f and intermediateblank-neck, wand the jam-nut h, all as shown and described.

, In testimony whereofI have hereunto signed my name and affixed myseal, in the presence of two attesting witnesses, at Syracuse, in thecountyof Onondaga, in the State of New York, this 11th day of September,1882.

FRANK DE LORME.

